hendricks



May 26, 1931- B. A. HENDRlcKs 1,806,942

FUEL OIL HEATER Filed sept. 12 ,1927

ATTORN EY Patented May 26, 1931 PATENT, QFFICE BENJAMIN A. HENDRICKS,Ol' SEATTLE, WASHINGTON FUEL on. mmm

Application iiled September 12, 1927. Serial No. 218,998.

This invention relates to an electric liquid heater and is designed,more especially, for heating fuel oil in connection with an oil burner.

The object of the invention, generally is to provide a heater of thischaracter which will be economical in the consumption of electricity andeffectual in operation.

A specific object is to provide an electric oil heater wherein anelectric heating element is most advantageously employed to utilize amaximum amount of the produced heat to the oil for raising itstemperature, and afford a liquid containing heating chamber which isproportioned and arranged with respect to its oil supply and deliverypipe connections that the heating of the oil is performed regularly andetiiciently.

The invention consists in the novel construction, adaptation, andcombination oi' parts hereinafter described and claimed.

ln the accompanying drawings, Figure 1 is a longitudinal section on line1 1 of Fig. 2, and llig. 2 a transverse section on line 2-2 of Fig.. 1showing an embodiment of the present invention. p

ln said drawings, the reference numeral 5 represents a metal tubular oilreceptacle to the ends of which are secured heads 6 and 7 provided withcentrally disposed screw threaded openings within which are engaged oilfeed and discharge pipes 8 and 9, respectively, of smaller diameter thansaid receptacle. if

Mounted upon the receptacle 5 are two annuiar plates 1G which extendinto the ends of a cylindrical tube 11 and are secured thereto as bymeans of screws 12. The tube 11 and the end plates 1() constitute thecasing of the heater. Within the casing and surrounding the receptacle 5is an electric heating element comprising a winding of a resistancewire13 located between two sheets 14 and 15 of mica or other suitableelectric insulating and refractory material. 16 represents leading-inwires for said resistance wire and which desirably are protected frominjury by the provision of a pipe conduit 17 therefor which is securedto one of' the casing ends as shown in Fig. 1. The space surrounding theouter sheet or wrapping 15 of mica, -within said casing is filled with asuitable heat insulating material 18 such as asbestos.

In use, the heater is used in a horizontal position, and for an oilburner of known construction is included in the fuel supply line 8-9 inclose proximity to the furnace in which the burner is installed. Theoperation of the heating element with respect to the oil within thereceptacle is obvious, but the arrangement of the element with respectto a receptacle which is relatively of large diameter compared with thefuel feed an delivery pipe and its horizontal arrangement differsfrom'other heaters which have come to myl notice. The purpose of thelarge diameter of' the receptacle a'ords capacity for a large volume ofoil in the receptacle and which volume is heated from its peripheryinwardly toward the longitudinal axis of the oil bodyU The rela1 tivelycold oil is supplied centrally into one end of such oil volume and notagainst the relatively hot surface of the receptacle;

while the delivery of oil centrally from the other end of such volumeensures an equable temperature of fuel to a burner. Such an arrangementof a drum, as it were, in the pipe line 8 9 tends to ensure uniformityas to temperature and iuidity of the oil which is delivered from myheater, resulting in a practically constant and even nozzle dame whenassociated with an oil burner.

What l claim, is,-

1. An electric oil heater consisting of a horizontally disposedcylindrical casing having its opposite ends centrically apertured, acylindrical oil receptacle of uniformV diameter throughout its lengthextending through the apertures of the respective ends, said receptaclebeing of a length exceeding that of the casing to project exteriorly ofboth ends, oil supply and discharge pipes of less diameter than thereceptacle connected to respective extremities and axially of the same,tubular members comprising sheets of electric insulating materialdisposed concentrically about the outer periphery of the receptacle andin spaced relatlons, one with 2 1,soe,e4a

another, an electric heating device comprising a coil of resistance wireprovided in the space between said tubular members, and a mass ofinsulating materlal surrounding the 5 outer of said tubular members,said o1l receptacle being unobstructed to ermit a free circulation tothe oil passing t erethrou h. y 2. An electricoil heater consisting. o ahorizontally disposed cylindrical casing having its opposite endscentrically apertured, Aa cylindrical oil rece tacle ofuni orm di ameterthroughout lts length extending through the apertures of the respectiveends, said reeeyliltacle being of a length exceedin that of t e casingto prc'ect exteriorly o both ends, oil supply an discharge pipes of lessdiameter than the receptacle connected to respective extremities andaxially of the same, an electric heating device comprisl f ing a coil ofresistance wlre rovided exteriorly of said receptacle, an a mass ofinsulating material surrounding said resistance wire, said oilreceptacle being unobstructed to permit a free circulation to the oilpassing therethrough.

Signed at Seattle, Washington, this 18th day of August 1927.

a BENJAMIN A. HENDRICKS.

